Method and apparatus for obtaining location information

1. An apparatus for obtaining location information, the apparatus comprising:

a receiver, configured to receive signal features and an identity of a to-be-positioned terminal that are sent by multiple base stations, wherein the signal feature of a base station comprises a signal power and additional features comprising a base station identity of the base station and a signal transmission time;

a processor, configured to:

determine a relative power set according to signal powers sent by the multiple base stations, wherein the relative power set comprises a relative power between any two base stations in the multiple base stations, and

determine, according to the relative power set and additional features sent by the multiple base stations, location information of a terminal corresponding to the identity of the to-be-positioned terminal.

2. The apparatus according to claim 1 , wherein the processor is further configured to:

calculate a difference between a signal power sent by a first base station and a signal power sent by a second base station, wherein the first base station and second base station are base stations in the multiple base stations; and

determine the difference as a relative power between the first base station and the second base station, and add the relative power to the relative power set.

3. The apparatus according to claim 1 , wherein the processor is further configured to:

separately obtain, according to the relative power set and the additional features sent by the multiple base stations, positioning arrays corresponding to all relative powers comprised in the relative power set, so as to form a positioning array set; and

determine, according to the positioning array set and from a correspondence between a positioning array set and location information, the location information of the terminal corresponding to the identity of the to-be-positioned terminal.

4. The apparatus according to claim 3 , wherein the processor is further configured to:

determine two base stations corresponding to a first relative power, wherein the first relative power is any relative power comprised in the relative power set;

separately obtain, from the additional features sent by the multiple base stations, additional features sent by the two base stations; and

combine the first relative power and the additional features sent by the two base stations into a positioning array corresponding to the first relative power.

5. The apparatus according to claim 1 , wherein the processor is further configured to:

obtain location information of a measured terminal;

obtain, according to the signal features sent by the multiple base stations, a positioning array set corresponding to the measured terminal; and

store, within a memory, the positioning array set and the location information of the measured terminal in a correspondence between a positioning array set and location information.

6. The apparatus according to claim 5 , wherein the processor is further configured to:

calculate a relative power between any two base stations in the multiple base stations according to the signal powers sent by the multiple base stations, so as to form the relative power set; and

separately obtain, according to the relative power set and the additional features sent by the multiple base stations, positioning arrays corresponding to all relative powers comprised in the relative power set, so as to form the positioning array set corresponding to the measured terminal.

7. The apparatus according to claim 1 , wherein:

the additional features further comprises a signal-to-noise ratio; and

the processor is further configured to:

select effective base stations from the multiple base stations according to signal-to-noise ratios comprised in the additional features sent by all the base stations in the multiple base stations, and

calculate a relative power between any two effective base stations in the effective base stations according to signal powers sent by the effective base stations, so as to form the relative power set.

8. The apparatus according to claim 7 , wherein the processor is further configured to:

separately compare the signal-to-noise ratios sent by all the base stations in the multiple base stations with a preset threshold; and

select base stations with signal-to-noise ratios greater than the preset threshold as the effective base stations.

9. The apparatus according to claim 7 , wherein the processor is further configured to:

sort the signal-to-noise ratios sent by all the base stations in the multiple base stations according to a preset order;

obtain a preset quantity of maximum signal-to-noise ratios from all the sorted signal-to-noise ratios; and

select, from the multiple base stations, base stations corresponding to the obtained signal-to-noise ratios as the effective base stations.

10. A method for obtaining location information, the method comprising:

receiving signal features and an identity of a to-be-positioned terminal that are sent by multiple base stations, wherein the signal features of a base station comprises a signal power and additional features comprising a base station identity of the base station and a signal transmission time;

determining a relative power set according to signal powers sent by the multiple base stations, wherein the relative power set comprises a relative power between any two base stations in the multiple base stations; and

determining, according to the relative power set and additional features sent by the multiple base stations, location information of a terminal corresponding to the identity of the to-be-positioned terminal.

11. The method according to claim 10 , wherein determining a relative power set according to signal powers sent by the multiple base stations comprises:

calculating a difference between a signal power sent by a first base station and a signal power sent by a second base station, wherein the first base station is any base station in the multiple base stations, and the second base station is any base station other than the first base station in the multiple base stations; and

determining the difference as a relative power between the first base station and the second base station, and adding the relative power to the relative power set.

12. The method according to claim 10 , wherein determining, according to the relative power set and additional features sent by the multiple base stations, location information of a terminal corresponding to the identity of the to-be-positioned terminal comprises:

separately obtaining, according to the relative power set and the additional features sent by the multiple base stations, positioning arrays corresponding to all relative powers comprised in the relative power set, so as to form a positioning array set; and

determining, according to the positioning array set and from a correspondence between a positioning array set and location information, the location information of the terminal corresponding to the identity of the to-be-positioned terminal.

13. The method according to claim 12 , wherein separately obtaining, according to the relative power set and the additional features sent by the multiple base stations, positioning arrays corresponding to all relative powers comprised in the relative power set comprises:

determining two base stations corresponding to a first relative power, wherein the first relative power is any relative power comprised in the relative power set;

separately obtaining, from the additional features sent by the multiple base stations, additional features sent by the two base stations; and

combining the first relative power and the additional features sent by the two base stations into a positioning array corresponding to the first relative power.

14. The method according to claim 10 , wherein before receiving signal features and an identity of a to-be-positioned terminal that are sent by multiple base stations, the method further comprises:

obtaining location information of a measured terminal;

receiving signal features sent by multiple base stations, wherein the signal features comprises a signal power and additional features comprising a base station identity and a signal transmission time;

obtaining, according to the signal features sent by the multiple base stations, a positioning array set corresponding to the measured terminal; and

storing the positioning array set and the location information of the measured terminal in a correspondence between a positioning array set and location information.

15. The method according to claim 14 , wherein obtaining, according to the signal features sent by the multiple base stations, a positioning array set corresponding to the measured terminal comprises:

calculating a relative power between any two base stations in the multiple base stations according to signal powers sent by the multiple base stations, so as to form the relative power set; and

separately obtaining, according to the relative power set and the additional features sent by the multiple base stations, positioning arrays corresponding to all relative powers comprised in the relative power set, so as to form the positioning array set corresponding to the measured terminal.

16. The method according to claim 10 , wherein:

the additional features further comprise a signal-to-noise ratio; and

determining a relative power set according to signal powers sent by the multiple base stations comprises:

selecting effective base stations from the multiple base stations according to signal-to-noise ratios comprised in the additional features sent by all the base stations in the multiple base stations, and

calculating a relative power between any two effective base stations in the effective base stations according to signal powers sent by the effective base stations, so as to form the relative power set.

17. The method according to claim 16 , wherein selecting effective base stations from the multiple base stations according to signal-to-noise ratios comprised in the additional features sent by all the base stations in the multiple base stations comprises:

separately comparing the signal-to-noise ratios sent by all the base stations in the multiple base stations with a preset threshold; and

selecting base stations with signal-to-noise ratios greater than the preset threshold as the effective base stations.

18. The method according to claim 16 , wherein selecting effective base stations from the multiple base stations according to signal-to-noise ratios comprised in the additional features sent by all the base stations in the multiple base stations comprises:

sorting the signal-to-noise ratios sent by all the base stations in the multiple base stations according to a preset order;

obtaining a preset quantity of maximum signal-to-noise ratios from all the sorted signal-to-noise ratios; and

selecting, from the multiple base stations, base stations corresponding to the obtained signal-to-noise ratios as the effective base stations.